Lasting-jack



(No Model.)

,I'.' HALL. I LASTING JAQK.

No. 251,714 Patented Jan.'3,1882.

i UNITED STATES PATENT OFFICE.

ISAAC HALL, OF BOSTON, MASSACHUSETTS.

TLASTINGD-JACK.

SPECIFICATION formingpart of Letters Patent No. 251,714, dated January3, 1882, i Application filed June 4, 1881. (No model.)

To all whomtt may concern Be it known that I, ISAAC HALL, of Boston,

county of Suffolk, State of Massachusetts, have inventedan Improvementin Lasting-Jacks, of

which the following description, in connection with the accompanyingdrawings, is a specification. 7 p y My invention relates to jacks forholding boots and shoes while an outer sole is being nailed thereon orother work is being doneto the bottom thereof; and it consists in thecombination, with a metal last or metal-shod last provided with a recessin its top,of a standard or'upright and locking-block connectedtherewith, adapted to enter the said recess when the said block is inthe proper position, and then by an automatic movement of the said block'to lock the last rigidly upon the said standard'while the boot or shoeis being operated upon. The said socket or recess in the last, as shown,is made straightat its rear side or toward the heel of the last, whileits front side'inclines first backward and then forward, forming anangular projection in the recess, which is thus made narrower at themiddle of its depth than at its mouth or at its deepest part. Thestandardat its rear side corresponds to the shape of the rear side ofthe said socket,-while at its front side it inclines back, forming'asurface corresponding to the portion of the front edge of the socket,which inclines back from its mouth to the middle of its depth. Theextremity of the front portion of the standard is recessed or cut away,anda wedgeshaped block is placed in the said recess, the block beingmounted on a rod extending through the said standard, and being movablelongitudinally therewith toward and from the end .of the said standard.A spring acts to hold the said block down upon the end of the standard,the front face of the block inclining forward from its junction with therearwardlyinclined upper end ofthe front face of the stand ard, as shownin Fig. 2. The last can be placed on the standard only when the rod andblock are pressed upward above the standard by the action of asuitablelever or treadle. When the block and last are allowed to descendtogether upon the top of the standard the said standard and block filland fit the said socket, locking the last firmly in position. When it isdesired 1 and.

tion between the front face of the block and the rear face of thestandard, so that it can be readily removed.

Figure l is a side elevation of my improved jack,the locking-block beingelevated to permit thelast to be mounted on or removed from thestandard, as desired, the last being shown partly in section; Fig. 2, asimilar view, with the locking-block lowered and the last fastenedthereby upon the standard. Fig. 3 is an enlarged sectional detail ofpart of the last and last-block, and means to adjust and lock the samein position, Fig. 4, adetail of the key,

5 a detail of the block-adjusting device.

' The metal last a is provided with a socket, 0, extending inward fromthe top of the heel portion. The rearportion orwallofthe said socket hasits face 2 inclined preferably forward from the mouth or opening to thebottom of the said socket, as shown, and its front face inclined 5narrower from front to back at the middle of its depth than at itsbottom or its mouth.

The standard 01, mounted on the benche, has

at its upper end a notch or recess, 5, to receive the last-locking blockt", which is mounted on a rod,m, extended down through the saidstandard. The red at and connected block tare normally pressed downwardby a spring, it, thus retaining the said block in the recess at the topof the standard, the shape of the said end, together with the block 6thereon, as shown in Fig. 2, corresponding exactly to the shape of thesocket in the last, the upper end of the said standard and block beingdovetail-shaped, or wider than the said standard at the bottom of thesaid block, so that while in the position shown in Fig. 2 it isimpossible to remove the last therefrom.

A lever, r, engaging the lower end of the rod m, is connected with andoperated by a treadle, t, to raise the said rod and removethelast-locking block 13 from its recess 5 at the end of the standard d, asshown in Fig. 1, when alast may be readily placed thereon or removedtherefrom, as shown in Fig. 1.

In order to place the last a upon the standard the treadle t is moved bythe operator to raise the block 1', as shown in Fig. 1, when the last ais properly placed thereon, it receiving the block i in the bottom andforward portion of the socket c, where it rests against the inclinedface 4 thereof, after which the treadleis' released and the last andblock carried down together upon the standard, which wedges into thesaid socket, holding the said last rigidly. The last, when pressed uponfrom above, bears mainly with its surfaces 2 3 upon the rigid inclinedportions of the standard at front and back, the block 1' merely servingto hold it securely in place thereon. When desired to remove the lastthe treadle t is depressed, thus raising the block 1', causing it to actas alifter and lift the last, and, if desired, throw it upward off fromthe standard.

The lower portion oi'the standard, above the bench 6, may be madetubular in any usual way for the passage below the bench of the usualendless strap, (not shown,) which in practice will be passed over thesole on the boot or shoe, and will be pressed or held thereon by atreadle or the foot of the operator.

The last-block 1), preferably of wood, has at its front end a pin, 6, toenter a hole in the metal toe part of the last a, while at its rear endit is bored to receive a locking device composed of a pin, 0, acted uponat one end by a spring,f, confined in a recess in the last, the springbeing held therein by a plug, 9. The tendency of the springfis to throwthe pin 0 far enough for its point to enter a hole in the blockadjusting device h, as in dotted lines, which so locks the block that itcannot be removed from the last. The shank of the pin 0 is toothed, asat S, to be acted upon by the toothed part 9 of the mover or key 10 ofthe block-locking device. This mover or key may be inserted into a holein the last-block, so as to engage the toothed or notched part of thepin 0; and then, by turning the shank of the key from its dotted linepositiontoward its full -line position, Fig. 3, the pin 0 will beWithdrawn from the last-block-adjusting device, and the block may thenbe easily lifted from the last a. This block-adjusting device It isshown as a screw having an enlarged beveled head provided with a hole oropening, 13, to receive the end of the pin 0. By rotating this adjustingdevice h its top may be moved more or less from the bottom of the last,so as to hold the large end of the block b more or less from the body ofthe last a, thus making the last more or less thick at its shank orinstep portion.

I claim 1. Thejack consisting of a lastprovided with asocket, and astandard therefor provided with a movable last-locking device or blockto enable it to enter the said socket and lock the last rigidly thereon,substantially as described.

2. The standard and wedge-shaped lockingblock titted in a recess in theend thereof, and

its spring-pressed actuating-rod to move the said block, combined withthe last provided with a socket shaped to tit the end of the standardand block when the latter is in position in the said recess,substantially as described.

ard and block 1', and means, substantially as described, to move itlongitudinally from the said standard, to thereby elevate and releasethe last or throwit from the standard, as hereinbefore set forth.

4. The combination, with the last a and its block b, of thespring-actuated toothed or notched pin and the key to withdraw the saidpin, substantially as described.

5. The last a. and its block b, combined with. the block adjustingdevice provided with a shank, which is inserted into the last between itand the block, substantially as described.

6. The last, its block, and adjusting device, combined with thelockingdevice to engage the said adjusting device, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ISALAO HALL. Witnesses:

W. H. SIGSTON, G. W. GREGORY.

3. The socketed last, combined with the stand-

